[gtk] (7 commits) Non-fast-forward update to branch matthiasc/for-master

[Matthias Clasen <matthiasc src gnome org>]

The branch 'matthiasc/for-master' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  7f0ebdc... menubutton: initial accessibility setup
  f218ba2... popovermenu: Initial accessibility setup
  228e450... popovermenubar: Initial accessibility setup
  e70e0c2... separator: Remove unnecessary code
  4795cc6... modelbutton: Initial accessibility setup

Commits added to the branch:

  b9ae54c... separator: Remove unnecessary code
  087c007... menubutton: initial accessibility setup
  6d14289... popovermenu: Initial accessibility setup
  5c7ac97... popovermenubar: Initial accessibility setup
  0f81e23... modelbutton: Initial accessibility setup
  6e788be... modelbutton: Recreate our AT context
  1badc34... atspi: Give model buttons a click action too